code: def test_should_take_default_credentials_from_env(self):
      # given
      os.environ[API_TOKEN_ENV_NAME] = API_TOKEN
  
      # when
      credentials = Credentials.from_token()
  
      # then
      self.assertEqual(API_TOKEN, credentials.api_token)
  
file_path: neptune-client/tests/unit/neptune/new/internal/test_credentials.py
imports: import os
  import unittest
  from neptune.common.exceptions import NeptuneInvalidApiTokenException
  from neptune.envs import API_TOKEN_ENV_NAME
  from neptune.internal.credentials import Credentials
label_desc: Use image node_id 1 for calling the TestCredentials obj's underlying member method code with example usage: obj.test_should_take_default_credentials_from_env() without return types